Structure of the flavivirus helicase: implications for catalytic activity, protein interactions, and proteolytic processing.Wu, J., Bera, A.K., Kuhn, R.J., Smith, J.L.
(2005) J Virol 79: 10268-10277
- PubMed: 16051820
- DOI: https://doi.org/10.1128/JVI.79.16.10268-10277.2005
- Primary Citation of Related Structures:
- PubMed Abstract:
Yellow fever virus (YFV), a member of the Flavivirus genus, has a plus-sense RNA genome encoding a single polyprotein. Viral protein NS3 includes a protease and a helicase that are essential to virus replication and to RNA capping. The 1.8-A crystal structure of the helicase region of the YFV NS3 protein includes residues 187 to 623. Two familiar helicase domains bind nucleotide in a triphosphate pocket without base recognition, providing a site for nonspecific hydrolysis of nucleoside triphosphates and RNA triphosphate. The third, C-terminal domain has a unique structure and is proposed to function in RNA and protein recognition. The organization of the three domains indicates that cleavage of the viral polyprotein NS3-NS4A junction occurs in trans.
Department of Biological Sciences, Purdue University, West Lafayette, Indiana 47907, USA.